Need a Steak Condiment for a dinner party

[Beta Man]

Here's the thing.... We're having company over, and I picked up a whole-beef-tenderloin to grill.

Normally I'd just go with a Medium-rare tenderloin and dig in, but we're having guests, so I wanted "options" to prevent any foolish souls from pouring steak sauce on a good cut of beef.... (I understand not everyone likes that much meat.... it's just the way it is)

SO.....

I'm looking for a good Bearnaise sauce recipe, or "similar" in similar, I mean.... if someone has some "other" type of sauce that I could make, that compliments the steak with out over-powering it etc... that would be great.... I really just want to add something to "dress it up"

I don't have anything else, but I guess I "could" go out and buy some Prawns etc... but I don't really think I want to go with the bacon-wrapped route, but again, I'm open to suggestions.

My wife is taking care of the salad etc... so not sure what it is, and I'm doing a sort of seasoned potato side-dish.


Suggestions? I'm leaning towards bearnaise simply out of "familiarity"